(103) The third very fertile source of doubt is the fact that Hebrew verbs in the indicative mood lack the present, the past imperfect, the pluperfect, the future perfect, and other tenses most frequently employed in other languages; in the imperative and infinitive moods they are wanting in all except the present, and a subjunctive mood does not exist. (104) Now, although all these defects in moods and tenses may be supplied by certain fundamental rules of the language with ease and even elegance, the ancient writers evidently neglected such rules altogether, and employed indifferently future for present and past, and vice versa past for future, and also indicative for imperative and subjunctive, with the result of considerable confusion. (105) Besides these sources of ambiguity there are two others, one very important. (106) Firstly, there are in Hebrew no vowels; secondly, the sentences are not separated by any marks elucidating the meaning or separating the clauses. (107) Though the want of these two has generally been supplied by points and accents, such substitutes cannot be accepted by us, inasmuch as they were invented and designed by men of an after age whose authority should carry no weight. (108) The ancients wrote without points (that is, without vowels and accents), as is abundantly testified; their descendants added what was lacking, according to their own ideas of Scriptural interpretation; wherefore the existing accents and points are simply current interpretations, and are no more authoritative than any other commentaries.